One button gives you the power to 'veto' a single presidential candidate for the next US election; if they win, *magic* happens and the second runner up takes their place.
The other button magically guarantees no unfriendly AI will happen in humanity's future. You press:
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It would depend on what kind of magic is needed to make either situation happen.
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I think by the time we actually make an unfriendly AI that poses an actual threat, we will have methods to deal with it.
The worst unfriendly AI is other people.